- weight
- 1.41 g
- sun
- 5.0× wider
- sky
- deep orange
Illustration computed from this world’s measured and derived values, not a photograph.
LTT 3780 c
LTT 3780 c is a confirmed sub-Neptune exoplanet 71.7 ly from Earth in the constellation Hydra, discovered in 2020 by Transiting Exoplanet Survey Satellite (TESS).
Transit: spotted by the tiny, repeating dip in its star’s light each time the planet crosses in front of it.
Standing on LTT 3780 c, you would weigh about 41% more than you do on Earth. Its red dwarf looks 5.0× wider than ours, bathing the surface in deep orange light. It is likely tidally locked, so that sun never moves in the sky: one hemisphere in endless day, the other in permanent night. A year passes in just 12 days, and at an estimated 86°C (187°F) it is warm.
How closely this world matches Earth in size and warmth, from 0 to 1 (Earth = 1.0). Computed by gravityfinder. See every world ranked →
What these mean: surface gravity · tidal locking · equilibrium temperature · Earth similarity
If your children grew up herea playful thought experiment
A little heavier than home, at 1.4 times Earth's gravity. A child raised here would likely grow a little shorter and sturdier than their Earth-raised parents, about 0.93x as tall as on Earth: a 5 ft 10 in adult could stand nearer 5 ft 5 in, with denser bones.
- Bones
- Thick and dense
- More weight to bear forces the skeleton to grow denser and stronger all through childhood.
A playful thought experiment from this world’s gravity, not a prediction about any real person. No human has ever grown up off Earth, so no one truly knows; the direction (taller in low gravity, shorter and stockier in high) follows how growing bodies respond to weight.
Hear how a voice sounds herea computed acoustic demo
Your voice would sound noticeably higher and reedier.
Assuming Earth-like air at this world's temperature of about 86°C (187°F), sound would travel roughly 12% faster than on Earth, so your voice would sound noticeably higher and reedier. The real atmosphere is unknown, so this is a best guess.
A real voice sample, pitch-shifted (tempo held constant) to suggest the acoustics: a playful approximation, not a precise simulation. Voice: Lingua Libre / Vealhurl, CC BY-SA 4.0.
- !Persistently hot at around 86°C (187°F), well above anything you would call comfortable.
- Surface gravity is close to Earth's, 1.41 times, so you would move much as you do here.
- !Likely tidally locked: one hemisphere in endless day, the other in permanent night.
A playful read of LTT 3780 c’s measured and computed values, not a real advisory.
How long to get there · 71.7 ly away
Zoom out: star → system → (soon) galaxy arm, host black hole, and a real image of the host galaxy.
Matched telescope & eyepiece recommendations are coming. Any product links will carry a clear affiliate disclosure.
What is the gravity on LTT 3780 c?
LTT 3780 c's surface gravity is about 1.4 times Earth's.
How much would you weigh on LTT 3780 c?
Someone who weighs 150 pounds on Earth would weigh about 211 pounds on LTT 3780 c.
How far is LTT 3780 c from Earth?
LTT 3780 c lies about 71.7 light-years from Earth.
How long would it take to get to LTT 3780 c?
At the speed of NASA's Parker Solar Probe, the fastest craft ever built, the journey would take about 111,814 years.
How hot is LTT 3780 c?
LTT 3780 c's equilibrium temperature, the balance it reaches from its star's light alone before any greenhouse warming, is about 86°C (187°F).
How long is a year on LTT 3780 c?
LTT 3780 c completes one orbit of its star in 12 days.
Illustration generated from LTT 3780 c's confirmed parameters, not a photograph.